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          <th colspan="3" align="center">Score File Preprocessing</th>
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            <h2 class="title" style="clear: both"><a id="CommandPreproc"></a>Score File Preprocessing</h2>
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              <h3 class="title"><a id="commandpreextract"></a>The Extract Feature</h3>
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      <a id="IndexExtract" class="indexterm"></a>
      This feature will extract a segment of a sorted numeric score file according to instructions taken from a control file. The control file contains an instrument list and two time points, from and to, in the form:
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          <pre class="programlisting">instruments 1  2  from  1:27.5  to  2:2</pre>
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      The component labels may be abbreviated as i, f and t. The time points denote the beginning and end of the extract in terms of:
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          <pre class="programlisting">[section no.] : [beat no.].</pre>
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      Each of the three parts of the argument is optional. The default values for missing i, f or t are:
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          <pre class="programlisting">all instruments, beginning of score, end of score.</pre>
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